I am going to keep this short, but I'm just debating the point that the force talk scenes did nothing for Rey's character. Defending TLJ as a whole is difficult, but I did enjoy the Rey / Kylo sequences. The challenge is that these two characters needed to develop a relationship (not romantic) somehow without trying to kill each other. While backstory on Rey would be interesting, I liked the decision to focus on her emotions and motives.
At the start of the film, Rey believes (like much of SW fandom) that Luke Skywalker is the last hope for the galaxy. She looks to Luke for answers about her purpose, the force, her past, etc. When she first force chats with Kylo, she is still angry at him. As the scenes progress and Luke's unwillingness sinks in, she begins to latch to Kylo. Rey is desperate for answers and for a hero, but she is unable to process that she is the hope that the resistance needs. So, she runs to Kylo thinking her part in this story is redeem him, mirroring Luke's approach with Vader.
Kylo is on the opposite end of the spectrum. He wants power and control, but he also desperately needs validation from others. Rey provides that. Kylo delivers a message that greatly resonates (tempts) Rey, that she is important to him and the past should be forgotten. It seems effective, but she realizes it is not the correct path, and at that point, their paths completely diverge. By the end of the film, Rey closes herself off from Kylo for good, and Leia delivers the key lesson to Rey that the resistance has what it needs.
So, I guess to me, these scenes are what propel Rey forward. They get us to the point where she finally accepts that she is the hope for the galaxy.